/Engine/Plugins/Experimental/PCG/Source/PCG/Public/Graph/PCGStackContext.h
A single frame of a call stack, represented as a pointer to the associated object (graph/subgraph or node) or a loop index.
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FPCGStackFrame
int32
LoopIndex
TWeakObjectPtr<...
Object
A valid frame should either point to an object or have a loop index >= 0.